Influence of loading direction on the anisotropic fatigue properties of rolled magnesium alloy |
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| Affiliation: | 1. School of Materials Science and Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea;2. Division of Industrial Metrology, Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea;3. Department of Mechanical Engineering, Hanyang University, Ansan 426-791, Republic of Korea;4. Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea;5. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea;1. Light Metals Team, Korea Institute of Materials Science, Changwon 642-831, Republic of Korea;2. Advanced Materials Engineering, University of Science and Technology, Daejeon 305-350, Republic of Korea;3. School of Materials Science and Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea;1. School of Mechanical Engineering, Pusan National University, Busan, 46241, Republic of Korea;2. Advanced Forming Process R&D Group, Korea Institute of Industrial Technology, Ulsan, 44413, Republic of Korea;3. School of Materials Science and Engineering, Kyungpook National University, Daegu, 41566, Republic of Korea;1. Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Ministry of Education, Zhejiang University of Technology, Hangzhou, Zhejiang 310032, China;2. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310032, China;3. University of Nevada, Reno, Department of Mechanical Engineering, Reno, NV 89557, USA;1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea;2. Center for Advanced Aerospace Materials, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea;3. Graduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea;4. Light Metal Division, Korea Institute of Materials Science (KIMS), Changwon 642-831, Republic of Korea |
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| Abstract: | The influence of loading direction on the fatigue behavior of rolled AZ31 alloy was investigated by conducting fully reversed stress-controlled fatigue tests along the rolling direction and normal to the rolling plane. Alternating twinning and detwinning behavior during initial cycling was found to cause asymmetric hysteresis loops, resulting in a compressive strain in the rolling direction and a tensile strain normal to the rolling plane. A transition in the dominant deformation mechanism from twinning–detwinning to slip occurs at around five cycles under both conditions due to cyclic hardening, thus making their loops symmetric. The lower twinning stress in tension along the normal direction leads to an increase in fatigue damage by plastic strain, resulting in a lower fatigue resistance than along the rolling direction. |
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| Keywords: | Magnesium alloy Fatigue Anisotropy Loading direction Twinning |
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